[KSCI] Korea Science Citation Index Service

http://dx.doi.org/10.15435/JILASSKR.2021.26.3.135

Numerical and Experimental Study to Improve Thermal Sensitivity and Flow Control Accuracy of Electronic Thermostat in the Engine for Hybrid Vehicle

Jeong, Soo-Jin (한국자동차연구원 강소특구지원단)
Jeong, Jinwoo (인지컨트롤스 TMS개발실)
Ha, Seungchan (인지컨트롤스 TMS개발실)

Publication Information

Journal of ILASS-Korea / v.26, no.3, 2021 , pp. 135-141 More about this Journal

Abstract

High-efficient HEV Engine cooling systems reflects variable coolant temperature because it can decrease the hydrodynamic frictional losses of lubricated engine parts in light duty conditions. In order to safely raise the operating temperature of passenger cars to a constant higher level, and thus optimize combustion and all accompanying factors, a new thermostat technology was developed : the electronically map-controlled thermostat. In this work, various crystalline plastics such as polyphthalamide (PPA) and polyphenylenesulfide (PPS) mixed with various glass fiber amounts were introduced into plastic fittings of automotive electronic controlled thermostat for the purpose of suppressing influx of coolant into the element and undesirable opening during hot soaking. Skirt was installed around element frame of automotive electronic controlled thermostat for improving thermal sensitivity in terms of response time, hysteresis and melting temperature. To validate the effectiveness and optimum shape of skirt, thermal sensitivity test and three-dimensional CFD simulation have been performed. As a consequence, important improvement in thermal sensitivity with less than 3℃ of maximum coolant temperature between opening and engine inlet was obtained.

Keywords

Electronic controlled thermostat(ECT); HEV Engine; Flow control strategy; Thermal sensitivity test; CFD;

Citations & Related Records

Reference

1	M. B. Bigdeli, M. Fasano, A. Cardellini, E. Chivazzo and P. Asinari, "A Review on the Heat and Mass Transfer Phenomena in Nanofluid Coolants with Special Focus on Automotive Applications", Renewable and Sustainable Energy Reviews, Vol. 60, 2016, pp. 1615~1633. DOI
2	S.-J. Jeong, G. Lee, S. Kim, W-S. Choi, "Numerical Modeling and Experimental Validation of an Integrated Coolant Control Valve for the Optimum Design of Coolant Circuit for a Three-Cylinder GDI Engine", Transactions of KSAE, Vol. 26, No. 4, 2018, pp. 540~550. DOI
3	G. Liu, Z. Zhao, H. Guan, Y. Liu, C. Zhang, D. Gao, W. Zhou and J. Knauf, "Influence of Advanced Technology for Thermal Management on SUV", SAE 2016-01-0238, 2016.
4	K. Hwang, I. Hwang, H. Lee, H. Park, H. Choi, K. Lee, W. Kim, H. Kim, B. Han, J. Lee, B. Shin and D. Chae, "Development of New High-Efficiency Kappa 1.6L GDI Engine", SAE 2016-01-0667, 2016.
5	C. Donn, W. Zulehner, D. D. Ghebru, U. Spicher and M. Honzen, "Experimental Heat Flux Analysis of an Automotive Diesel Engine in Steady-State Operation and During Warm-up", SAE 2011-24-0067, 2011.
6	H. W. Jeong, H. S. Chan, Y. J. Kim, J. H. Jang, S. K. Kim and S. J. Jeong, "Development of Flow Control Strategy for Improving Thermal Sensitivity of Electronic Thermostat for Downsized GDI Engine", Proceedings of KSAE Autumn Conference, 2017, pp. 88~89.
7	J. W. Jeong and S-J. Jeong, "Experimental Study to Improve Thermal Sensitivity and Reliability of Electronic Thermostat for Hyundai Kappa Engine", INZI Controls Internal Report, 2017.
8	S. K. Kim, Y. J. Kim, H. W. Jeong, W. I. Jeong, J. W. Jeong and S. J. Jeong, "Application of Graphene Platelets on Electronic Controlled Thermostat of TGDI Engine for Improving Thermal Sensitivity", Transaction of KSAE, Vol. 25, No. 1, 2017, pp. 66~73. DOI
9	G. Liu, H. Guan, Y. Liu, C. Zhang, D. Gao, W. Zhou and J. Knauf, "Influence of Advanced Technology for Thermal Management on SUV", SAE 2016-01-0238, 2016.